Programming Concepts using Java Quiz 2: 3 August 2025 (May 2025 term)

1class Printer {
2    public <T extends Number> void printDetails(T value) { // LINE 1
3        System.out.println("Number: " + (value.doubleValue() * 3));
4    }
5    public <U extends Number> void printDetails(U value) { // LINE 2
6        System.out.println("Double Number: " + (value.doubleValue() * 6));
7    }
8    public <T> void printDetails(T value) { // LINE 3
9        System.out.println("Value: " + value);
10    }
11}
12public class Test {
13    public static void main(String[] args) {
14        Printer p = new Printer();
15        p.printDetails(7);
16        p.printDetails(3.5);
17        p.printDetails("Java");
18    }
19}

1import java.util.*;
2    public class SetTest {
3        public static void main(String[] args) {
4        LinkedList<Integer> list = new LinkedList<Integer>();
5        list.add(20);
6        list.add(30);
7        list.add(10);
8        list.add(40);
9        HashSet<Integer> set1 = new HashSet<Integer>(list);
10        TreeSet<Integer> set2 = new TreeSet<Integer>(set1);
11        set2.addAll(set1);
12        System.out.println(set2);
13    }
14}

1class User {
2    private String username;
3    private String password;
4    public User(String u, String p) {
5        assert u != null;               // assert-1
6        assert p != null;               // assert-2
7        username = u;
8        password = p;
9    }
10    public boolean login() {
11        assert !username.isEmpty();            // assert-3
12        assert password.length() >= 6;         // assert-4
13        return username.equals("admin") && password.equals("admin123");
14    }
15}
16public class AssertTest {
17    public static void main(String[] args) {
18        User user = new User("admin", "");
19        System.out.println("Login status: " + user.login());
20    }
21}